Abstract
As a combination of microwave Multiple-Input Multiple-Output (MIMO) antenna system and mm-wave antenna array, an integrated design is proposed to provide multi-band, high port isolation, and high gain antenna solution for 4G/5G wireless devices. In this work, an array of tapered slots is used as a decoupling structure at microwave frequency and as an antenna array at mm-wave frequency. The proposed geometry consists of a dual-band monopole MIMO antenna system operating at 4G (2.6 GHz) and 5G (3.5 GHz) sub-6 GHz bands. The wideband port isolation of more than 25 dB is achieved by introducing a tapered slot array structure. One of the key design features is the utilization of these slots as an antenna array with a peak realized gain of 15 dBi at 28 GHz, making this array dual-functional, thus more feasible for compact 4G/5G handheld devices. The proposed design is printed on an RO-5880 substrate with an overall size of 70 mm × 50 mm × 0.51 mm. The measured -10-dB impedance matching bandwidth covers two sub-6 GHz bands (from 2.45 GHz to 2.85 GHz and from 3.18 GHz to 3.68 GHz), and the wide mm-wave band from 25 GHz to 30 GHz.
Highlights
Compact, integrated, and multi-functional antennas have recently been investigated intensively and are highly desirable for various applications in wireless communication systems, especially in handheld devices where size constraint persists
This work presents a concept of dual-band monopole Multiple-Input Multiple-Output (MIMO) antenna integrated with a tapered slot antenna array (TSAA) for 4G/5G mobile devices
An integrated antenna design employing dual-functional tapered slot antenna array has been presented for 4G/5G applications
Summary
Compact, integrated, and multi-functional antennas have recently been investigated intensively and are highly desirable for various applications in wireless communication systems, especially in handheld devices where size constraint persists. There are serious challenges, such as size constraints and high number of antenna elements at low frequency bands in MIMO technology and path loss, penetration, and high gain antenna arrays in mm-wave technology. This work presents a concept of dual-band monopole MIMO antenna integrated with a tapered slot antenna array (TSAA) for 4G/5G mobile devices. Due to the small inter-element spacing (
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